(i)Two small spheres 18 cm apart have equal negative charges and repel each other with the force of `6 xx 10^-8` N. Find the total charge on both spheres

Two point charges whose magnitudes are in the ratio 3 : 2 repel each other with a force 135 xx 10^14 N when they are 4 cm apart in air. Find the magnitude of each charge.

Two point charges, each of 4 mu C when placed in vacuum, repel each other with a force of 1.6 Newton. Calculate the distance between the two charges.

Two equally charged, identical metal spheres A and B rpepel each other with a force F. the spheres are kept fixed with a distance r between them. A third identical, but uncharged sphere C is brought in contact with A and then placed at the mid-point of thr line joining A and B. the magnitude of the net electric force on C is

Two point charges repel each other with a force of 100 N. one of the charges is increased by 10% andother is reduced by 10% . The new force of repulsion at the same distance would be

A body of mass explodes at rest break up into three parts. If two parts having equal masses fly off perpendicularly to each other with a velocity of 18 m//s , then calculate the velocity of the third part which has a mass 3 times the mass of each part.

Two point charges +3 muC and +8 muC repel each other with a force of 40 N. if a charge of -5 is added to each of them, then the force between them will become

The electric field intensity at a point at a distance of 1metre from the centre of a charged sphere of radius 25 cm is 10^4 N/C . Find the surface density of charge on the surface of the sphere. The sphere is situated in air .

Two point charges of 2 coulomb and 6 coulomb repel each other with a force of 12 newton. If each charge is given an additional charge of -2 coulomb then the force between them will become

Two small insulated metal spheres placed 5 cm apart in air carry charges of 5 and 0.5 micro- coulomb respectively. Find the force between them. What would the force be if the spheres are in a medium of dielectric constant 3?